Triangle read by rows: T(n,k) is the number of achiral combinatorial maps with n edges and k vertices, 1 <= k <= n + 1.
A380617
Triangle read by rows: T(n,k) is the number of achiral combinatorial maps with n edges and k vertices, 1 <= k <= n + 1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =1a(6) =5a(7) =8a(8) =5a(9) =2a(10) =16a(11) =28a(12) =26a(13) =12a(14) =3a(15) =53a(16) =121a(17) =128a(18) =82a(19) =28a(20) =6a(21) =206a(22) =528a(23) =686a(24) =505a(25) =239a(26) =68a(27) =10a(28) =817a(29) =2516
External references
- oeis: A380617